CN101987343B - Forging method of conical cylinder body of nuclear power equipment - Google Patents

Forging method of conical cylinder body of nuclear power equipment Download PDF

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Publication number
CN101987343B
CN101987343B CN 200910057728 CN200910057728A CN101987343B CN 101987343 B CN101987343 B CN 101987343B CN 200910057728 CN200910057728 CN 200910057728 CN 200910057728 A CN200910057728 A CN 200910057728A CN 101987343 B CN101987343 B CN 101987343B
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China
Prior art keywords
forging
temperature
nuclear power
pulling
reaming
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CN 200910057728
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Chinese (zh)
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CN101987343A (en
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陈永波
林岳萌
陶志勇
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上海重型机器厂有限公司
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Abstract

The invention discloses a forging method of a conical cylinder body of nuclear power equipment. The conical cylinder body is formed by forging 18MND5 and 185 tons of double vacuum steel ingots by using a 16,500-ton hydraulic press. The forging method comprises the following steps of: drawing out; oxygen-acetylene cutting; continuous upsetting; forging a center hole; drawing out and separating materials; and reaming. According to the forging method of the conical cylinder body of the nuclear power equipment, the temperature can be strictly controlled in the forging process, so that the temperature of a forging piece is always maintained in a range of 850-1,240 DEG C, the forging ratio at each step can be ensured and the forging piece formed by forging is not easy to generate cracks and has uniform wall thickness; and the forging piece has the advantages of dense material, uniform components, reasonable metal streamline distribution and stable performance.

Description

The forging method of nuclear power generating equipment conical shell

Technical field

The present invention relates to a kind of forging method, be specifically related to a kind of forging method of nuclear power conical shell.

Background technology

At present, global nuclear power has got into a high-speed developing period, and in order to improve energy resource structure, each industrially developed country and developing country are all in the development of actively being devoted to nuclear power.The U.S. will enlarge the important component part of nuclear energy as national energy policy, have considerable part to update at more than 100 nuclear power station of using as a servant; Russia has formulated fairly large nuclear power plan, and existing 5 base groups are in construction; Japanese government proposes nuclear power and founds a state, and plans newly-built 13 nuclear power stations before 2010, after 2011, builds 7 nuclear power stations again; The Asia also has 11 countries to propose respectively to develop nuclear power except that China, Japan and Korea.Before the year two thousand twenty, the whole world needs more than 20 cover nuclear power forging every year at least, and the market prospects of nuclear power forging are boundless.

But because the quality requirements to forging is high in the nuclear power projects, and forge weight is bigger, adopts existing forging method can't realize the manufacturing of nuclear power generating equipment conical shell.

Summary of the invention

Technical problem to be solved by this invention provides a kind of forging method of nuclear power generating equipment conical shell, and it can produce the nuclear power generating equipment conical shell.

For solving the problems of the technologies described above, the technical solution of the forging method of nuclear power generating equipment conical shell of the present invention is:

Using 16500 tons of hydraulic presses, is 18MND5 with material, and weight is that two vacuum steel ingots forgings of 185 tons become conical shell, and concrete grammar is divided into following steps:

The first step, pulling; Two vacuum steel ingots are heated to 1220 ℃, and pulling becomes 4800mm with the length of 3298mm, makes forging ratio reach 1.45; Reduce to below 850 ℃ like the forging temperature in the pulling process, forging is reheated, the temperature of forging is remained in 850~1220 ℃ the scope;

Second step, oxygen-acetylene cutting; The forging bottom is removed one section, make the height of 4800mm become 4250mm, make the fully excision of two vacuum steel ingots bottom;

The 3rd step, jumping-up; Temperature is heated to 1240 ℃, through jumping-up, the height of 4250mm is become 1800mm, make forging ratio reach 2.36; Reduce to below 850 ℃ like the forging temperature in the upsetting process, forging is reheated, the temperature of forging is remained in 850~1240 ℃ the scope;

In the 4th step, forge centre bore; Temperature is heated to 1200 ℃,, on forging, forges the center hole of diameter 1600mm, guarantee inside and outside concentric circles through forging centre bore; Forge in the centre bore process and reduce to below 850 ℃, forging is reheated, the temperature of forging is remained in 850~1200 ℃ the scope like the forging temperature;

The 5th step, the pulling sub-material; Temperature is heated to 1220 ℃,, blank is divided into three steps through the pulling sub-material; In proportion blank is divided into three steps, three length of bench are identical, and the step drop is identical.Reduce to below 850 ℃ like the forging temperature in the pulling sub-material process, forging is reheated, the temperature of forging is remained in 850~1220 ℃ the scope;

The 6th step, reaming; Temperature is heated to 1200 ℃,,, makes forging ratio reach 1.55 by the completion of forging requirement size through reaming; Three steps progressively expand, when three steps expand after be straight line the synchronous reaming of whole contact.Reduce to below 850 ℃ like the forging temperature in the reaming process, forging is reheated, the temperature of forging is remained in 850~1200 ℃ the scope.

The technique effect that the present invention can reach is:

The forging method of nuclear power generating equipment conical shell of the present invention, strict control temperature in forging process remains in 850~1240 ℃ the scope forging temperature; And guarantee the forging ratio in each step, and the forging behind the forging molding is difficult for cracking, and wall thickness is even; And the forging material is fine and close; Composition is even, and metal streamline distributes rationally, stable performance.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation:

Fig. 1 is the sketch map of 185 tons of two vacuum steel ingots;

Fig. 2 is the size sketch map through the forging of pulling;

Fig. 3 is the size sketch map through the forging of jumping-up;

Fig. 4 is the size sketch map through the forging of forging centre bore;

Fig. 5 is the size sketch map through the forging of pulling sub-material;

Fig. 6 is the size sketch map through the forging of reaming;

Fig. 7 is the flow chart of the forging method of nuclear power generating equipment conical shell of the present invention.

The specific embodiment

The forging method of nuclear power generating equipment conical shell of the present invention uses 16500 tons of hydraulic presses, is 18MND5 with material; Weight is 185 tons; Ingot mouthful diameter on one's body is that 2878mm, ingot body lower port diameter are 2481mm, highly are 4955mm for two vacuum steel ingots forgings of 3298mm become external diameter that internal diameter is 4240mm, highly is 2720mm; The conical shell of monolateral 15 degree of tapering, forging method is divided into following steps:

The first step, pulling; Two vacuum steel ingots as shown in Figure 1 are heated to 1220 ℃, and pulling becomes 4800mm with the length of 3298mm, and is as shown in Figure 2, makes forging ratio reach 1.45; Reduce to below 850 ℃ like the forging temperature in the pulling process, forging is reheated, the temperature of forging is remained in 850~1220 ℃ the scope;

Second step, oxygen-acetylene cutting; The forging bottom is removed one section, make the height of 4800mm become 4250mm, guarantee the fully excision of two vacuum steel ingots bottom;

The 3rd step, jumping-up; Temperature is heated to 1240 ℃, through jumping-up, the height of 4250mm is become 1800mm, as shown in Figure 3, make forging ratio reach 2.36; Reduce to below 850 ℃ like the forging temperature in the upsetting process, forging is reheated, the temperature of forging is remained in 850~1240 ℃ the scope;

In the 4th step, forge centre bore; Temperature is heated to 1200 ℃,, on forging, forges the center hole of diameter 1600mm, guarantee inside and outside concentric circles through forging centre bore, as shown in Figure 4; Forge in the centre bore process and reduce to below 850 ℃, forging is reheated, the temperature of forging is remained in 850~1200 ℃ the scope like the forging temperature;

The 5th step, the pulling sub-material; Temperature is heated to 1220 ℃,, blank is divided into three steps through the pulling sub-material, sub-material in proportion, three length of bench are basic identical, and the step drop is basic identical, and is as shown in Figure 5; Reduce to below 850 ℃ like the forging temperature in the pulling sub-material process, forging is reheated, the temperature of forging is remained in 850~1220 ℃ the scope;

The 6th step, reaming; Temperature is heated to 1200 ℃,,, makes forging ratio reach 1.55 by the completion of forging requirement size through reaming; Three steps progressively expand, after the expansion of three steps extremely is straight line basically, and the synchronous reaming of whole contact, as shown in Figure 6; Reduce to below 850 ℃ like the forging temperature in the reaming process, forging is reheated, the temperature of forging is remained in 850~1200 ℃ the scope.

Forge by above step, calculate according to the RCC-M standard, total forging ratio reaches 5.3.

The forging method of nuclear power generating equipment conical shell of the present invention has solved the difficult point of tapering processing in the forging process, has forged man-hour, can guarantee that diameter and tapering meet the demands simultaneously.

The present invention can be used for making the conical shell of Fan family mountain steam generator.

Claims (2)

1. the forging method of a nuclear power generating equipment conical shell is characterized in that, uses 16500 tons of hydraulic presses, is 18MND5 with material, and weight is that two vacuum steel ingots forgings of 185 tons become conical shell, and concrete grammar is divided into following steps:
The first step, pulling; Two vacuum steel ingots are heated to 1220 ℃, and pulling becomes 4800mm with the length of 3298mm, makes forging ratio reach 1.45; Reduce to below 850 ℃ like the forging temperature in the pulling process, forging is reheated, the temperature of forging is remained in 850~1220 ℃ the scope; Second step, oxygen-acetylene cutting; The forging bottom is removed one section, make the height of 4800mm become 4250mm, make the fully excision of two vacuum steel ingots bottom;
The 3rd step, jumping-up; Temperature is heated to 1240 ℃, through jumping-up, the height of 4250mm is become 1800mm, make forging ratio reach 2.36; Reduce to below 850 ℃ like the forging temperature in the upsetting process, forging is reheated, the temperature of forging is remained in 850~1240 ℃ the scope;
In the 4th step, forge centre bore; Temperature is heated to 1200 ℃,, on forging, forges the center hole of diameter 1600mm, guarantee inside and outside concentric circles through forging centre bore; Forge in the centre bore process and reduce to below 850 ℃, forging is reheated, the temperature of forging is remained in 850~1200 ℃ the scope like the forging temperature;
The 5th step, the pulling sub-material; Temperature is heated to 1220 ℃,, blank is divided into three steps through the pulling sub-material; Reduce to below 850 ℃ like the forging temperature in the pulling sub-material process, forging is reheated, the temperature of forging is remained in 850~1220 ℃ the scope;
The said the 5th goes on foot the method that pulls out sub-material does, in proportion blank is divided into three steps, and three length of bench are identical, and the step drop is identical;
The 6th step, reaming; Temperature is heated to 1200 ℃,,, makes forging ratio reach 1.55 by the completion of forging requirement size through reaming; Reduce to below 850 ℃ like the forging temperature in the reaming process, forging is reheated, the temperature of forging is remained in 850~1200 ℃ the scope.
2. the forging method of nuclear power generating equipment conical shell according to claim 1 is characterized in that: the method for said the 6th step reaming does, three steps progressively expand, when three steps expand after be straight line the synchronous reaming of whole contact.
CN 200910057728 2009-08-07 2009-08-07 Forging method of conical cylinder body of nuclear power equipment CN101987343B (en)

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CN101987343B true CN101987343B (en) 2012-12-05

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102825192B (en) * 2011-06-17 2015-08-19 上海重型机器厂有限公司 The forging method of the nuclear power generating equipment upper shell with outer step
CN102319854A (en) * 2011-08-18 2012-01-18 贵州航天新力铸锻有限责任公司 Forging method for side end enclosures of supercritical steam-water separators
CN102350474B (en) * 2011-08-19 2014-03-26 太原科技大学 Control method for hot forging structure property of Mn18Cr18N steel retaining ring
CN103567341B (en) * 2012-08-07 2016-01-06 上海重型机器厂有限公司 The method for forging and molding of CAP1400 nuclear pressure container nozzle belt
CN105033132B (en) * 2015-09-19 2017-06-23 中国第一重型机械股份公司 A kind of main pipeline hollow forging profiling forging method with the asymmetric pipe nozzle of overlength
CN107262648B (en) * 2017-07-13 2020-02-11 安徽众鑫科技股份有限公司 Double-sided punching process for rotor bracket
CN108705014B (en) * 2018-05-08 2019-11-08 石钢京诚装备技术有限公司 A kind of die forging method of module forging
CN110090914B (en) * 2019-04-23 2020-04-17 上海新闵(东台)重型锻造有限公司 Integral forging forming method for flange connecting pipe section of reactor pressure vessel cylinder

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Publication number Priority date Publication date Assignee Title
CN1135944A (en) * 1996-02-13 1996-11-20 张荣发 Forging process for inner and outer rings of conical bearings
EP1252946A2 (en) * 2001-04-25 2002-10-30 Muhr und Bender KG Method for producing rotationally symmetric parts
CN1736654A (en) * 2004-08-19 2006-02-22 中国北车集团大同电力机车有限责任公司 Integrated forging method of flange type step thin wall long sheath forging
CN101199979A (en) * 2006-12-15 2008-06-18 上海重型机器锻件厂 Forging method of large scale conical shell

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1135944A (en) * 1996-02-13 1996-11-20 张荣发 Forging process for inner and outer rings of conical bearings
EP1252946A2 (en) * 2001-04-25 2002-10-30 Muhr und Bender KG Method for producing rotationally symmetric parts
CN1736654A (en) * 2004-08-19 2006-02-22 中国北车集团大同电力机车有限责任公司 Integrated forging method of flange type step thin wall long sheath forging
CN101199979A (en) * 2006-12-15 2008-06-18 上海重型机器锻件厂 Forging method of large scale conical shell

Non-Patent Citations (2)

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Title
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刘凯泉 等.大型锥形筒体锻造技术研究.《机械工人(热加工)》.2007,(第7期), *

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